After creating server user account in Windows server 2012 (R2), how to add the user to local administrator group to grant it administrator privileges? This passage will tell you two easy ways to achieve this goal.
The following ways are introduced using server 2012 (R2) computer, and also apply to Windows 7 and Windows server 2008 (R2).
Step 1: Press Win +X to open Computer Management
Step 2: In the console tree, click Groups.
Computer Management\System Tools\Local Users and Groups\Groups
Step 3: Right-click the group to which you want to add a member, click Add to Group, and then click Add.
Step 4: In the Select Users (Computers, or Groups) dialog box, do the following:
Login into Windows server 2012 (r2) with administrator, and then do as following:
Step 1: Press Win + X to run Command Prompt (Admin).
In other Windows operational systems, you may have to click "Start", type "cmd" and press Enter to run command prompt.
Step 2: Type "net user" command to see what the user accounts are on Windows server 2012 (R2).
Step 3: Type the following command to add user account "genius" to local administrators group. And press Enter to complete this command.
net localgroup administrators genius /add